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When I made mine (based on Just Jeff's and blackbishop351's ideas as well as some others) I made the zipper really long. I use it more like a travel pod. There's NO pressure on the zipper on mine.

I used 1.9 DWR, and get lots of ventilation from the ends, which I don't cinch completely closed. It may be heavier than you need, or that you would make for yourself, although I do think the DWR can block more of the wind. I recently slept in the backyard at 28F with it, and it worked fine.

You use DWR nylon? Don't you have problems with condensation or a stuffy, humid environment inside the sock? The DWR I have experience with would not allow much air movement through the fabric, which would be great for it's wind stopper properties, but not so great for beathability.

“Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it." -Terry Pratchett

I get a small bit of air in through the slightly open ends (I don't cinch the ends completely closed), that keeps the air fresh in there, but doesn't steal much heat (it's a very slight air movement). If it ever did feel stuffy, I'd just zip open a small hole for some fresh air.

No problems so far... last test was this past weekend at 28F with 5mph breeze.

I still haven't had an opportunity to weigh mine. If I were going to try to save more weight, I'd most likely use 1.1 DWR, or maybe 1/2 sil and 1/2 1.1 DWR...? or something like that.

"Civilization is the limitless multiplication of unnecessary necessities." - Mark Twain
“I go to nature to be soothed and healed, and to have my senses put in order.” - John Burroughs

Oh...now it's getting to sound cool!
How bout make the bottom half dwr and top untreated?
Or just have a small bit at the top like a roof's ridge vent!

That's what i was thinknig afterwards. You want DWR on most of it to stop the wind. The ridge vent would probably be best. Maybe a foot wide and centered over the ridgeline with untreated. Then DWR on the rest.

I let Hooch use a really ugly, Frankenstein of a hammock sock I made a long time ago to use with a hammock that had side tie outs. It was tan untreated 1.9oz on top, olive drab 1.1oz DWR on the bottom, and gray 1.1oz silnylon on each end for splash protection. I had completely forgotten about having it until I was going through my gear for the RRG hang out.